Condenser



' vvide an improved and eiiicient variable co`n- Patented Jan. 24, 1928.

.UNITED STATES JACQUES LE GAUCEjAR,

PATENT orifice.

OF CHICAGO, ILLINOIS.

This invention relates to variable *electrical condensers, and particularly `to con- .denseis of this. character, such as are used with radio receiving apparatus.

The objects of this invention are to profeatures and improvements in construction as will be described more fully hereinafter. '.Certain features of my apparatus, and more particularly the dial construction, which are shown and described herein but not claimed are claimed in my copending application for indicating dials, filed December 1, 1925, Serial No. 72,461.

In the accompanying ,drawings illustrating this invention: L

Figure 1 is a longitudinalsectionalview; Figure 2 is a, bottom plan view of a por` tion-of the condenser; g.

Figure 3 is a rear view of the dial casing with the parts removed to show the interior construction; and

Figure 4 is a fragment showing` a portion of the dial and casing.

In the particular form of the invention as shown in these drawings, the frame 5 is formed f side plates 6l made4 of insulating material, and end cross. bars or plates 7 and 8. The frame side members 6 have upwardly extending arms or projections' 9 with cross-rods or bolts -lOion which one or more Vfixed plates-11 are mounted,A these plates" being held apart by spreaders or washers 12.

' These plates are connected by 'a conductor 13 with a binding post or .screw 14.

The movable plates '15 arecaitied on 'a shaft 16 which is-pivote'd. in4 the side meins bers 6. Two links 17 are'nfiounted on the Application tiled December 1 1925. Serial'No. 72,460.

substantially circular with projecting ears for engagement with the supporting bolts.'

The movable plates are connected by means of a conductor 46'with a binding post or screw 47.

The links 17 have downwardly projecting arms 20, having slots 2l therein which are engaged by a reciprocable cross. bar 22, the ends of this bar engaging with slots 23 in the side plates. The cross bar 22 isrigidly secured to a nut 24 whichis engaged b 'an adjusting screw 25. This screw may ave either right or left hand threads, but preferably' left hand, so that when itis turned in aA clockwise manner, it will swing the plates together. The -screw or threaded shaft 25 ,has a bearin0f'26 in the end cro piece 8 and is pointed at the o posite end as shown at 27 to form a pivot bearing for engagement with an adjustable bearing member 28 in the cross piece 7.

The shaft 25 is turned by means of a dial 29 which is connected with a knob 30.

The dial also coacts with an indicating member for indicating wave lengths, `as more particularly shown in liiefures 3 and 4. A casing 3l is secured to tiepanel 32V by means of screws 33 and isprovided with an -annular bearing for. a rotatable indicating disk 34. This disk' isd provided with aninternal gear 35 which is actuated by means of an oscillating eccentric lever'36, having teeth 37 at one end for engagement with the gear teeth and engaging at the with an eccentric 3 8 onthe sha 25. The eccentric lever has a slot 39 which enga es with a pin 40 secured tofthe casing 31. e disk 34 is provided with a scale or numbers as indicated at 4'1 whichare visible through an opening 42 in the casing. rlhe dial 29 is also provided' with a. scale 43 which may be brought to register with a point orA mark 44 on thecasing.

When the knob or dial is turned to turn' the shaft 25, the'eccentric will cause the eccentric arm 36 to swing on the pivot 40 and-,movethe disk one tooth for each complete revolution of the shaft, and theidisk will be held in adjusted position b ,means of a double pawl or. detent 45. The dial is preferably divided into divisions and the indicating disk 34 is also preferably divided into 60 divisions and a complete revolution of the indicating member will optposite' end l require sixty turns of the dial. The length of the arms 20`and the" pitch of the screw is alsoA preferably arran ed so that sixty turns of the dial will swing the adjustable plates fromV a position out of engagement with the. fixed plates to a position-in which they will coincide with the fixed plates, or in other words, to give aroniplete range of adjustment.

When the parts are proportioned in this manner, and are connected with other suitably arranged parts to make a receiving set,

the indicating member 34 may he calibrated to indicate wave lengths so that the set may be readily logged for different stations. 'v

I have found that round platesare particularly efiicicnt for use inv condensers of this character and my adjusting mechanism provides means whereby such plates may be moved or ad]usted with the greatest acc-uracy in order to provide vfor fine or close tuning. Such advantages and other advantages will also be apparent to those familiar with this art and it will also be noted that changes may be made in the size and proportion of the parts to adapt the device for different purposes and conditions and therefore I do 'notwish to be limited to the-exact construction herein described, except as specified in the following claims, in which I claim.

1. In a condenser, the combination of one or more fixed plates, one or more pivoted plates adapted to coact with said fixed plates, a screw, a nut' engaging with the screw and adapted to travel longitudinally thereon, and means for 'connecting the nut with the pivoted plates for swinging the same.

2. The combination of a frame having side members of '-'insulating material, a series of condenser plates mounted in said frame, a transverse shaft mounted in said frame, a series of plates mounted on said shaft and adapted to coact with the first named series, a threaded shaft mounted in said frame, a nut on said shaft, means connecting the nut with the last named plates for swinging said plates, and means for turning said threaded shaft.

3. The combination of a frame, fixed plates mounted in said frame, a transverse shaft in said frame, movable plates mounted on said shaft, arms'proiecting downwardly from said movable plates, a cross bar engagand engaging with said nut, and means for turning said shaft.

4. A condenser -11 nnprisingT a frame having sides formed of insulating mat` al, fixed plates mounted in said frame, a transverse shaft mounted in said frame, links secured to said shaft, plates secured'to said shaft and links and adapted to coact with the fixed plates, arms projecting from said links, a screw' mounted in said frame., a nuten said screw and a cross bar on said nut which engages with slots in said arms and with slots in the sides of the frame, the arrangement being such that. when the screw is turned, the cross barwill swing the plates on the transverse shaft.

5. A condenser romprisinga fraaie having sides formed of insulatin,f r material, a series of round plates having outwardly projecting ears, bolts engaging with said ears and said sides for'holding plates in position, a transverse shaft mounted in raid frame, links en.

gaging with said shaft, a second series of round vplates having projectingars en aging with said transverse shaft and witi a cros`s' boit through said links, arms projecting outwardly from said links, a4 threaded shaft mounted in said frame and having an adjustable bearing at one end thereof, a nut engaging with said shaft, a cross-piece o`n said .nut which engages with slots in said arms, and is guided in the slots in the frame whereby, when thelthreaded shaft is turned, the links and connected plates will be swung on the transverse shaft to adjust them with respect to the first named plates.

6. In a variable condenser, the combination of a support, fixed plates mounted in said sup ort, movable plates pivotally mounted in t e suppr't adjacent to the fixed plates and adapted tocoact therewith, a longitudinally movable" cross head mounted in said support and adapted to coact with the movable plates for swinging the same, and means for reciprocatingl said ordss head.

7. In a condenser, the combinationof a -frame, a fixed plate mounted in said frame,

a movable plate pjvotally mounted in the frame adjacent tei'the fixed plate, a lon 'tudinally movable cross head mounted in t 1e frame, means for connecting the cross head with the movable platefor swinging the am, and means for reciprocating the cross ea JACQUES LnnAUoEAR. 

